Photoproduction of 
                
                  
                
                $${\varvec{\pi }}^{{\varvec{-}}}{\varvec{\varDelta }}^{{\varvec{++}}}$$
                
                  
                    
                      
                        
                          
                            π
                          
                        
                        
                          -

Kohri, H.

doi:10.1007/s00601-018-1411-x

Cited by 1 publication

(1 citation statement)

References 21 publications

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“…The yield of the π + ∆ 0 reaction was obtained by fitting to the missing mass with a relativistic Breit-Wigner shape [33,34] for the ∆ 0 bump. The background under the bump was fitted with curves for 2π, 3π, ρ, and positron events which were reproduced by GEANT simulations [35]. The shapes of the curves were fixed and the heights of the curves were free parameters to fit to the background.…”

Section: Photon Beam Asymmetriesmentioning

confidence: 99%

Recent results of charged pion and kaon photoproduction on the proton at SPring-8/LEPS

Kohri

2020

EPJ Web Conf.

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We carry out photoproduction experiments by using linearly polarized photon beams with energies of 1.5-3 GeV at SPring-8/LEPS. One of our physics motivations is to understand reaction mechanisms of hadron photoproduction. We study (1) y→p→ π-Δ++, (2) y→p→ π+n, (3) y→p→ K+Λ(K+Σ0), and (4) y→p→ π+Δ0 reactions which produce (1) uu, (2) dd, (3) ss, and (4) dd quark-antiquark pairs in the final state. Differential cross sections and photon beam asymmetries have been measured at forward meson angles of 0.6 < cos θcm <1. Precise comparison between the π-Δ++ and π+Δ0 reactions plays an important role in the study of nucleon resonances. It enables to distinguish between N* and Δ* by taking the cross section ratios of the two reactions. We have measured preliminary cross section ratios dσ(π+Δ0)/dσ(π-Δ++). The ratios are found to be close to 1/3, which is expected from the exchange of isospin=1 in the t channel, for 0.966< cos θcm <1 and all the photon energies. The ratios become larger than 1/3 and close to 1 for larger angles and higher energy regions. The larger ratios might be due to A resonances, giving the ratio 4/3, excited in the intermediate state

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Section: Photon Beam Asymmetriesmentioning

confidence: 99%